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Merge pull request #1972 from nextcloud/invalid-files-from-scanner 

Make sure we don't scan files that can not be accessed
This commit is contained in:
Roeland Jago Douma 2016-11-22 12:55:54 +01:00 committed by GitHub
parent b8732a1a53 558f169671
commit df215625f1
7 changed files with 138 additions and 27 deletions
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10
lib/private/Files/Cache/Scanner.php
View File

@ -131,6 +131,13 @@ class Scanner extends BasicEmitter implements IScanner {
* @throws \OCP\Lock\LockedException
*/
public function scanFile($file, $reuseExisting = 0, $parentId = -1, $cacheData = null, $lock = true) {
if ($file !== '') {
try {
$this->storage->verifyPath(dirname($file), basename($file));
} catch (\Exception $e) {
return null;
}
}
// only proceed if $file is not a partial file nor a blacklisted file
if (!self::isPartialFile($file) and !Filesystem::isFileBlacklisted($file)) {
@ -167,6 +174,9 @@ class Scanner extends BasicEmitter implements IScanner {
// scan the parent if it's not in the cache (id -1) and the current file is not the root folder
if ($file and $parentId === -1) {
$parentData = $this->scanFile($parent);
if (!$parentData) {
return null;
}
$parentId = $parentData['fileid'];
}
if ($parent) {

25
lib/private/Files/Storage/Common.php
View File

@ -45,8 +45,10 @@ use OC\Files\Cache\Scanner;
use OC\Files\Cache\Updater;
use OC\Files\Filesystem;
use OC\Files\Cache\Watcher;
use OCP\Files\EmptyFileNameException;
use OCP\Files\FileNameTooLongException;
use OCP\Files\InvalidCharacterInPathException;
use OCP\Files\InvalidDirectoryException;
use OCP\Files\InvalidPathException;
use OCP\Files\ReservedWordException;
use OCP\Files\Storage\ILockingStorage;
@ -487,8 +489,31 @@ abstract class Common implements Storage, ILockingStorage {
/**
* @inheritdoc
* @throws InvalidPathException
*/
public function verifyPath($path, $fileName) {
// verify empty and dot files
$trimmed = trim($fileName);
if ($trimmed === '') {
throw new EmptyFileNameException();
}
if (\OC\Files\Filesystem::isIgnoredDir($trimmed)) {
throw new InvalidDirectoryException();
}
if (!\OC::$server->getDatabaseConnection()->supports4ByteText()) {
// verify database - e.g. mysql only 3-byte chars
if (preg_match('%(?:
\xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3
| [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15
| \xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16
)%xs', $fileName)) {
throw new InvalidCharacterInPathException();
}
}
if (isset($fileName[255])) {
throw new FileNameTooLongException();
}

40
lib/private/Files/View.php
View File

@ -53,8 +53,10 @@ use OC\Files\Storage\Storage;
use OC\User\User;
use OCP\Constants;
use OCP\Files\Cache\ICacheEntry;
use OCP\Files\EmptyFileNameException;
use OCP\Files\FileNameTooLongException;
use OCP\Files\InvalidCharacterInPathException;
use OCP\Files\InvalidDirectoryException;
use OCP\Files\InvalidPathException;
use OCP\Files\Mount\IMountPoint;
use OCP\Files\NotFoundException;
@ -1788,39 +1790,25 @@ class View {
* @throws InvalidPathException
*/
public function verifyPath($path, $fileName) {
$l10n = \OC::$server->getL10N('lib');
// verify empty and dot files
$trimmed = trim($fileName);
if ($trimmed === '') {
throw new InvalidPathException($l10n->t('Empty filename is not allowed'));
}
if (\OC\Files\Filesystem::isIgnoredDir($trimmed)) {
throw new InvalidPathException($l10n->t('Dot files are not allowed'));
}
if (!\OC::$server->getDatabaseConnection()->supports4ByteText()) {
// verify database - e.g. mysql only 3-byte chars
if (preg_match('%(?:
\xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3
| [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15
| \xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16
)%xs', $fileName)) {
throw new InvalidPathException($l10n->t('4-byte characters are not supported in file names'));
}
}
try {
/** @type \OCP\Files\Storage $storage */
list($storage, $internalPath) = $this->resolvePath($path);
$storage->verifyPath($internalPath, $fileName);
} catch (ReservedWordException $ex) {
throw new InvalidPathException($l10n->t('File name is a reserved word'));
$l = \OC::$server->getL10N('lib');
throw new InvalidPathException($l->t('File name is a reserved word'));
} catch (InvalidCharacterInPathException $ex) {
throw new InvalidPathException($l10n->t('File name contains at least one invalid character'));
$l = \OC::$server->getL10N('lib');
throw new InvalidPathException($l->t('File name contains at least one invalid character'));
} catch (FileNameTooLongException $ex) {
throw new InvalidPathException($l10n->t('File name is too long'));
$l = \OC::$server->getL10N('lib');
throw new InvalidPathException($l->t('File name is too long'));
} catch (InvalidDirectoryException $ex) {
$l = \OC::$server->getL10N('lib');
throw new InvalidPathException($l->t('Dot files are not allowed'));
} catch (EmptyFileNameException $ex) {
$l = \OC::$server->getL10N('lib');
throw new InvalidPathException($l->t('Empty filename is not allowed'));
}
}

31
lib/public/Files/EmptyFileNameException.php Normal file
View File

@ -0,0 +1,31 @@
<?php
/**
* @copyright Copyright (c) 2016 Joas Schilling <coding@schilljs.com>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCP\Files;
/**
* Class EmptyFileNameException
*
* @package OCP\Files
* @since 9.2.0
*/
class EmptyFileNameException extends InvalidPathException {
}

31
lib/public/Files/InvalidDirectoryException.php Normal file
View File

@ -0,0 +1,31 @@
<?php
/**
* @copyright Copyright (c) 2016 Joas Schilling <coding@schilljs.com>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCP\Files;
/**
* Class InvalidDirectoryException
*
* @package OCP\Files
* @since 9.2.0
*/
class InvalidDirectoryException extends InvalidPathException {
}

26
tests/lib/Files/Cache/ScannerTest.php
View File

@ -70,6 +70,32 @@ class ScannerTest extends \Test\TestCase {
$this->assertEquals($cachedData['mimetype'], 'image/png');
}
function testFile4Byte() {
$data = "dummy file data\n";
$this->storage->file_put_contents('foo🙈.txt', $data);
if (\OC::$server->getDatabaseConnection()->supports4ByteText()) {
$this->assertNotNull($this->scanner->scanFile('foo🙈.txt'));
$this->assertTrue($this->cache->inCache('foo🙈.txt'), true);
$cachedData = $this->cache->get('foo🙈.txt');
$this->assertEquals(strlen($data), $cachedData['size']);
$this->assertEquals('text/plain', $cachedData['mimetype']);
$this->assertNotEquals(-1, $cachedData['parent']); //parent folders should be scanned automatically
} else {
$this->assertNull($this->scanner->scanFile('foo🙈.txt'));
$this->assertFalse($this->cache->inCache('foo🙈.txt'), true);
}
}
function testFileInvalidChars() {
$data = "dummy file data\n";
$this->storage->file_put_contents("foo\nbar.txt", $data);
$this->assertNull($this->scanner->scanFile("foo\nbar.txt"));
$this->assertFalse($this->cache->inCache("foo\nbar.txt"), true);
}
private function fillTestFolders() {
$textData = "dummy file data\n";
$imgData = file_get_contents(\OC::$SERVERROOT . '/core/img/logo.png');

2
tests/lib/Files/PathVerificationTest.php
View File

@ -86,7 +86,7 @@ class PathVerificationTest extends \Test\TestCase {
if (!$connection->supports4ByteText()) {
$this->expectException(InvalidPathException::class);
$this->expectExceptionMessage('4-byte characters are not supported in file names');
$this->expectExceptionMessage('File name contains at least one invalid character');
}
$this->view->verifyPath('', $fileName);